Cristiano Ronaldo scored a hat-trick to inspire Real Madrid to a 4-0 victory
over Celta Vigo and earn a place in the quarter-finals of the King's Cup.

The Portugal forward, runner-up to Lionel Messi in Monday night's Ballon d'Or awards, netted twice inside the first 25 minutes at the Bernabeu and sealed victory near the end after Sergio Ramos had been sent off.

Real's 5-2 aggregate win sets up a meeting with Valencia next week.

"It needs to be pointed out, Cristiano has scored four goals across the tie," Real director Emilio Butragueno said.

"His contribution has been decisive. He has been the player of the tie, and we are lucky to have him."

The Cup has taken on added importance for Jose Mourinho's Real, with Barcelona leading them by 16 points in La Liga.

Mourinho fielded the strongest side available to him with Iker Casillas restored to the starting line up after being dropped to the substitutes' bench for the last two games.

The return of the popular Spain No 1 led to cheers when his name was read out before kick-off, while Mourinho was once again met with a mixture of whistles and applause.

His stewardship of the club has come under increasing scrutiny in recent weeks from local media and disgruntled fans.

"This is a stadium that is very demanding," Butragueno replied when asked about the whistles for Mourinho, who did not speak after the game.

"I remember the fans here getting on my back too, the most important thing was the team's performance, particularly in the first half."

Ronaldo has pleaded with Real fans to get off Mourinho's back and to support the team.

"I have to ask that they (the fans) stop this now," Ronaldo said.

"The boss is going to stay, we still have a lot we can win this year. He is in charge and he takes the decisions, the fans and the players should help him.

"People have shown they are unhappy but that's enough now. They have to get behind the boss and the team. It affects the players out on the pitch. If we win the Cup and the Champions League it will have been a good year."

Ronaldo has also had to win his own personal battle to convince home fans, who have whistled him in the past despite his prolific scoring record.

"I have felt the support of the Bernabeu for some time now and it makes me happy," Ronaldo added. "If the fans are with me, it motivates me."

He was also asked about interest from big-spending Paris St Germain and speculation over possible contract renewal negotiations with Real. His current deal runs until 2015.

"I have a contract and I am happy here but as you say, anything is possible in the world of football," he said.